描述
PLC的输入与输出最好采用分开走线，开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线，屏蔽层应一端或两端接地，接地电阻
电阻，物质对电流的阻碍作用就叫该物质的电阻。电阻小的物质称为电导体，简称导体。电阻大的物质称为电绝缘体，简称绝缘体。应小于屏蔽层电阻的1／10。
交流输出线和直流输出线不要用同一根电缆
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